1977?
i could easily be wrong,but from what i've noticed from my
WP/KM machines and others i have gotten a detailed look at,
the first # is the year while the 3# after that are julian
date of production(1-365),so if i am correct the washer was
made the 300th day of 1977.Other clues can provide the decade
of production.that looks like a BD 24",same basic mechanical
parts as fullsize BD,but uses polygroove belt and matching
pulleys.